Inter-layer and Interposition

noun

• The action of interjecting or interposing an action or remark that interrupts.
  • synonyms: interjection, interpolation, interpellation
• The act or fact of interposing one thing between or among others.
  • synonyms: intervention

• (n.) The act of interposing or the state of being interposed; a being, placing or coming between; mediation.
• (n.) The thing interposed.